Where does your data want to go today?

David F. Ogren ogren at cris.com
Fri May 31 05:56:02 PDT 1996


> > >	What problems does compression before encryption have? It at least
> > >seems to work for PGP.
> > >
> > Most compression schemes put a header/index on the front of the
> > compressed data.
> > This makes recognizing the correct decryption very simple.
> > 
> > Call it a limited "known plaintext" situation.
> 

Using a random IV also limits the effectiveness of using known 
headers for "known plaintext" attacks.  Also note that a good block 
cipher isn't that vulnerable even to "known plaintext" attacks.
--
David F. Ogren
ogren at concentric.net (alternate address: dfogren at msn.com)
PGP Key ID: 0xC626E311
PGP Key Fingerprint: 24 23 CD 15 BF 8D D1 DE  81 71 84 C8 2C E0 4B 01
(public key available via server or by sending a message to
ogren at concentric.net with a subject of GETPGPKEY)






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